"be in dynamics"?

Hi! How often do you hear the phrase "be in dynamics"? May I use it with the meaning like - be in sport? Does it sound correct?

I have never heard that phrase. Although I have heard the phrase, "be dynamic". This means that you have are able to change depending on what situation you are in. This could be used in sports. For example you could say, "The player is very dynamic". This means he is able to meet every challenge and overcome it.